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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0c2d656909d778ded0e2df2636f1c8dbd71865e17cec726bf221ecf29e8042' 
  AND token = 'yVn4q1Ow26R471SdS4p29L7xCSqIOQY+jvsCYJzPoFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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