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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0088e01b329ecd77a67f011df1e4b0ed5bd207746064405766dbe7539972815' 
  AND token = 'sAX7LNBw9mbW7upM+E3LTf2JZKcyvSPRP8ckMszM9h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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