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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492da4d00e19e649c0740d2875c88d300c4bfa238ffc1f34ec18db5d9780c3f9' 
  AND token = 'xQ00omdLA63igGVKFHAcnbXYpWWNTg2dIipocScFoI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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