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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9967d4838e62494360ca6e0cf96dd2a06f3112e477615780118dbf01e5d862cf' 
  AND token = 'ccg8Gyo6LGfbWgzbUAH7vOFbSYG2KVGbhqZcxAnyzQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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