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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d948197debfaa0c312badf55c044c6ebe6290739c803bda1728a1f3db6e1f8' 
  AND token = 'XmNcMnX9P9P2t9qtuojq0pcRfbYCQsBefeuo+1Z8aD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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