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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec60bfe772c910e0e95e01dfa63c422720266d60ee3799c5b7b2b18013da644' 
  AND token = 'LQuONTHiq82p5GmE1Ey9UZdieTVwZ5sXLPiUWMte8Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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