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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24223fae92db5f77fc73a1c54d83a9061b6e9b86c8cc075992a226c64b7ba6ee' 
  AND token = '1EuIs2WNnhxbx077GI3pTrEV3lr2iZQR5bbTGvtESB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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