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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6190d367e3068640111b415014c1c4fdf3cc69219627c96329af8fb62483122' 
  AND token = 'qBD2Zz4NbJDatLtsjBnQV5/r40MNrRmmyByYDb8/aj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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