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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bda72d09979aa981e8f5c87102e3e01c89a7ad6fcd5f2eade06901619bcc380' 
  AND token = 'La3cXDch5LcyRRE8MgxETnzf6XEedFqNlkuF6UT20oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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