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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8f5d308ea2f7e4fa912dc19b0af2e703a4e2b41d739981117b5a72a3498dd0' 
  AND token = 'AUsOgCY8wjJA83o2qWAUX41g5Njfos0y7yhq5q4dwWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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