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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8aa2496b40cdda9c859d6b1801d5d5850ab8462b23c767c28a608ea5416a5eb' 
  AND token = 'XVJCWddSsCY4mnRwo4Qco+TQFPjSAqQZEf041Fyvtig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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