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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe873ec7bc594a127d7e718ff3e27a178fa4a2e9e302a6c2d98476296ff5f1f3' 
  AND token = 'lBryJVeNg/lQR+lnl1aEpJGA9/EDf2JhAb3wjnogk9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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