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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144bf4074e68d6bf42b8d887ef5c9200e87cd9ba5bc64213b098546d8ffc8c9e' 
  AND token = 'r1qbhXFEF1jbLz7ehZW4atHHlg82U0R9c2LYw57UE3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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