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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53845a14f3659f7ffb42e2982f0ff8818cb4dcc79151ac27409a48ee4a1ebc2e' 
  AND token = 'HvEy48nj5WrR3V8vB8dPkqDBNUvOvabRu+ZysTmK9ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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