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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8948fb914f61e29ea37ff256e4dafda0543906d1cb31d08b07405608393428d' 
  AND token = 'u1bc18n7zVOKTSO7FVJARUNWGixPBq0GJ2D6Hsjv194=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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