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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d7a27f2134254023cfe834a40a28ef82f0f5c60589389b595e371c0e15a64d' 
  AND token = 'pyn3hvMI0ta0LOgedPkiTtH73DV9xsrIWDsEXNLXEJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00178

JSON explain

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