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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cd15e01da3f296f0377e7e6f475dc049dc75ccdd2f7795038d156f2142a6f4' 
  AND token = 'INvrnVP0RTQYlMdu0vIo/1Nli6wl+oe5TFChMZKS+rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}