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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3e3ee743ad264650423efd353d520eaa32e0c5268f2e57fba074cbf1c7ef4f' 
  AND token = 'g3dIMngqfKT8Kh2cNEfsGz6G5oMruQbF1m0p8SaG3Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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