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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb6669a344ab57ed78250657bc89520be31b7030a0ebdd13c22b67ff454930b' 
  AND token = '6T/zJsiRCriph9+YZap6j/nCu/1vroy92+bOPESdm4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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