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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e634fe2889183756d04890b5cfd9be8b863ebb6d7ae26e836dda4c8a6915d8' 
  AND token = 'L0Pd73b1uMZGbpLg0KzJAi+guVGoTs1VaZEJaOt0fZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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