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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4adfbf3420b2b86e7601039695b0a3deb34b7b09bcbdef2aca1ab245fcb6798' 
  AND token = 'zCmY2vufV9ymnS1o9eC3ex1J62Bi4/eUXqffdE5uFF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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