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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ccfeef9fab0fbacd7e6de2e35a889670a3c32b73e1df929b9332fdabd20bde' 
  AND token = 'GeK2Wk5KVXlAYNpzo0QkjofkXDQWyY6imZMS3Zsl4L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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