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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1b5c1c9bdf65f57addfd10a86c26375e7966c5f36efa589059e2c94a3f5830' 
  AND token = 'qrg5o1BCRx9BeyWud70UFLCD9g3kfdSJQ8RjNDtmxWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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