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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8afc38217cabc60bd16d60509d924a67c722e9e1824c57bd898d9ddadf2fa1f3' 
  AND token = 'rrL1c5uaa7gBUiEvpOm38h350dTmAAQchyPw68ReKNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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