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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba9df1bea5610b8c3fb7788d43a2fa3b59f6e5393f248136b209a739b66091b' 
  AND token = 'Mr0/zL4TTAnkYwKf38kgcZzt+DmHZDUTNaNnZEig5nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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