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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbd0a0973dadbc6d7a343a2964108c79513eee43e52681fd2002648eb9732c8' 
  AND token = 'cTDFmrrZE1WcJuugG+b7oEYl5hJbLaZIAsJ3nLKoR+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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