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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265c30a4ae4965420802e1fa362c5080a63a37985e2c7d4ec1008d95cb92e35e' 
  AND token = '43qY9iALGbSLtPboqqhYfNI19R3FTT4kZcuzmMiacow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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