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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e3a71ae48d474f95989c7a4c7bf946652a4e944cfecea1cf7359e90bc07ab6' 
  AND token = 'D5vIBrQ8i31L64gqCFh8Z4IimuFfSW89/wzyVBoKEDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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