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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3d41dcead5fff4a9323a0f9ce3ded53fd3093419cc6738d34a027d8b212ee2' 
  AND token = 'ihxhKjTZVXwO5uo8Yz3gXTi8R3FOT4SnFD89QzMy3rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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