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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f341a7c2bb19ee2cf99341643af95e96607a686b2dd338288ed41a9ac9bda606' 
  AND token = 'HpIy7x9pavZbhSZJtfhR61z3ydJ6t/NLghUwSKnQF3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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