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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9eb090ea1863077c8f6fe02f5638c7430192abbd43b6e83e658d37378e4ab90' 
  AND token = 'nlAB+XSPn7WMy1XsLIK0SoC+QVlHJIol9/+BcViz4iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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