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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852c09c0e2f2371cbc0f7bedf9f7ec4e80c5262e480f88b1d61d0b10dc457e32' 
  AND token = '/09yAzT7GBCw67YmGh7eRuJJ/2TOWw5SkPs8pBTyYC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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