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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38371a45bf5285fc08ace503ff7479481c588f494480131a7e543e150843c1ed' 
  AND token = 'mwW3Rpq0Xf9Hp4znCGQ2ZH1rWOBE/dsMUrFrfPBJi0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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