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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9477bf6966c41a66c6411be98c0cd29cdb3ff3ff1a77c4b775f267fe09ad228e' 
  AND token = 'WD9I8MxUwKC5mDMDNoWpmw/74ZiRjpvr4mxw0rg3Rfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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