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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d2f6c754ea4409f6bfcc63e025eea16b95c80aae7693a558c860d15fee9471' 
  AND token = 'mF6UAk14JYl1/H9Xfh7TQPbicE0hV49cfiJ+6dEtG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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