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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d35ee1636f5934d5134f93d5413e6615c58f84fdcbf02dad87abb80654851a2' 
  AND token = 'iXtc5bPWoy48EhjAyvWeN4WCzdt8hy5c2Wr8hWKOC0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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