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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd1bd7c1bde798910600c0acb3a53d1daaffaad9285ad48a4eceda8633c5279' 
  AND token = '0kyzdORkJ1Bj77QeqE1Ry62svuCdsHrsc4pu3PpJwqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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