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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c302051b04a62408cd94e860471f7b99dcf2c0d792f8775d75ead9eb0b31cf02' 
  AND token = 'IB2rpzTZHeKNYKbmRkp2WUj6vd0WxMAWajFSCVHDggg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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