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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e893ead3ecb36e0336564415df7285c2c2b95763a0f8207ffc6104d2fdeb67cc' 
  AND token = 'YW7dH4Xf71aSr1AefUdEYHgup0FFiuOrEPaR1InTj3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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