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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1087459c03a9f7adf1ebc4163c358b0bb464a59857c7283d564e9bc78bec098e' 
  AND token = 'a32KC6tldeFw8hzzjfF6M2DkM277bP098tY45SQSNwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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