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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5007df3a828b9174f8b393290cc17153926ce8fadf9e714b0b12a0bfb0241c7c' 
  AND token = 'wREvDT45lhv8xRSIJWW8LelMQF87kTQMYnj+9AU8s7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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