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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863b5f7885f894bc51bed69b0030e181ccfde56fadf92fa96255f2e5a136f266' 
  AND token = 'UxVDFhDohOBIfRdcbdSsAwPBiRkKsvK9YLqot5tkvGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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