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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8940af192906ec8153fffcf1771a3bf202ca2d3c4fa24845ba7ded982a100a' 
  AND token = 'FUPu6mo4qwa4YiLvHrnlHlqDpywneDp/TzMEfAkTMbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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