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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0fcd311e11ad7a76fa00930ad6fdc9cc98ef71a42205d1a6ee5b1647b41124' 
  AND token = '8WI02ZGbrHdZabtimUdj4vxSqt2UfJ8vd7wdWYzA9SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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