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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4d8502c35f2b2aa822e322bf52c06636a8f1dd2d2f65146f58c37ea8f3d119' 
  AND token = 'V7dWFW41goeP/qDNX0C5xt6+w0CCpdHbqNeW+bxe3IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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