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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804449750d106c1f61f2c287e6a054a21873216d23cd9c404b08d5c74c4e4d9c' 
  AND token = '47X6vMOiwyUNriIj21cyhSTks+NY70vAdsmsDJNCyrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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