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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e8237b66dbc7948acdaaba43d7d2f66ac299229b4edb70cce55a6a6258b03b' 
  AND token = 'j7EmWl2rg4QI5wHFw4FpfZPmhRnU0X7VtUCkgOiJ1vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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