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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c857d4417c8de9d7d6d79836c91a5cf8dbfa5389f99fe2c1bd92c129073007' 
  AND token = 'gvCSt7hPINKgllLKptaNnPlm3OOrj085yo/UV21UdtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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