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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe5b03a2ab1c3a6b66db8329597e3e092ba1baa7b5af5a62a70916a8f7655c4' 
  AND token = 'ndswD2hZlE/c1AHcZqkSx/SFJdXqvt5vApyIWHJ2Hp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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