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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e519123e79ab5a672af5d601a8136f0a16a3c92d44da81397147daf6bf3393e' 
  AND token = '0kRZPa3Sj7O3YjyY5V1XFNwIF87gt3polXhFK361Lqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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