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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ae4f6602a53800ed40b8b47c3e3a30a9d8dc4b74992fe2f623ece0191b1d2e' 
  AND token = 'kKmubawEGnbcDjWWCSVlm88H9bfR3rO+g3fGpJ0qJYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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