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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce7e417285b487879349eacfa8dd0d4aa8bbbc17a52c4114eafadd7fd00f7bc' 
  AND token = 'fXhdduOtqNVlhhUD9EBVxR9Hy3FrQZLvvPPNpr/01xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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