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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f7ffd292622fc1c64a88a8b5322a3f395ce75605e10736111d6215031310b8' 
  AND token = '1K6l0LCIvIZVRHSlazqgEZdH6l4ql/aKM6K+7QW0urA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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