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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf833ca737da475f3ad4301b07e1a7e6dbb9cca2c1fa6b8201d4be0ffd3e6d57' 
  AND token = 'FNqCx22aKS8/eTcp87HyiDUMvrsnEChhux1zSSJZsO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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